|What a wonderful story. Sad, but honest. I did not give you a 5 rating because there are just a few grammatical issues, and odd sentence structure in places. To find those odd places, I recommend reading the work outloud. Put voice and feeling into your reading and you will hear those places that I'm talking about and you'll be able to fix them.
Other than those few things, the story is magical. I am able to see this lakeside mansion. I am able to imagine how hard he worked to keep her happy when all she wanted was him. And I am even able to imagine the heartbreak of each character.
Oh, and thank you for bolding the prompts, it really helps. You did a good job using them. The only placement I do not agree with is the rivulet placement. However, that is the literal meaning of the word, so it was used correctly. It just seems...odd.
My favorite part of this story is when he thinks about all the times that he should have done this when he really did that.
How many times in our lives do we wish for that precious opportunity to change something that we did or did not do? If only we could see into the future to know where exactly those places lie on our personal paths we'd all probably make different decisions that make us much happier.
Great job, thanks for the read!